CASE STUDY Employees of the company Slovenský plynárenský priemysel, a.s. (SPP) receive and send more than 200,000 emails per month. Since unwanted emails (spam) account for more than three quarters of global email traffic, it is understandable that the company is trying to protect email servers and already overfull employee mailboxes from unwanted and potentially dangerous messages, especially when the cost of spam is enormous. These costs include a decrease in employee productivity as well as an increase in the cost of needed transfer capacity or storage space. According to the Journal of Economic Perspectives, spam imposes costs of almost $20 billion annually on global business. Initial state The managers of SPP are aware of the high costs and risks of spam, and they have trie

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